| 1 | <?php  | 
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| 7 | abstract class Process implements ProcessInterface  | 
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| 8 | { | 
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| 9 | /**  | 
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| 10 | * @var OutputInterface  | 
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| 11 | */  | 
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| 12 | protected $output;  | 
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| 13 | |||
| 14 | /**  | 
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| 15 | * @var int  | 
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| 16 | */  | 
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| 17 | protected $pid;  | 
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| 18 | |||
| 19 | /**  | 
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| 20 | * Process constructor.  | 
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| 21 | * @param OutputInterface $output  | 
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| 22 | */  | 
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| 23 | public function __construct(OutputInterface $output, $worker)  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * @return string  | 
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| 32 | */  | 
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| 33 | protected function getFormattedTime() : string  | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * @return int  | 
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| 41 | */  | 
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| 42 | public function getPid() : int  | 
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| 46 | }  | 
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| 47 | 
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: